Add some sweet XML classes.

client/html/release/html.dart

 #library('html');
 
 #import('dart:dom', prefix:'dom');
 #import('dart:htmlimpl');
 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // DO NOT EDIT
 // Auto-generated Dart HTML library.
@@ skipping 11263 matching lines @@
 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 interface DocumentFragment extends Element default DocumentFragmentWrappingImplementation {
  
   DocumentFragment();
 
   DocumentFragment.html(String html);
 
+  /** WARNING: Currently this doesn't work on Dartium (issue 649). */
+  DocumentFragment.xml(String xml);
+
+  DocumentFragment.svg(String svg);
+
   DocumentFragment clone(bool deep);
 }
 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 interface DOMApplicationCacheEvents extends Events {
   EventListenerList get cached();
   EventListenerList get checking();
   EventListenerList get downloading();
@@ skipping 2150 matching lines @@
 }
 
 interface Worker extends AbstractWorker {
 
   void postMessage(String message, [MessagePort messagePort]);
 
   void terminate();
 
   WorkerEvents get on();
 }
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+interface XMLDocument extends Document, XMLElement
+    default XMLDocumentWrappingImplementation {
+
+  /** WARNING: Currently this doesn't work on Dartium (issue 649). */
+  XMLDocument.xml(String xml);
+
+  XMLDocument clone(bool deep);
+}
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+interface XMLElement extends Element default XMLElementWrappingImplementation {
+
+  XMLElement.tag(String tag);
+  XMLElement.xml(String tag);
+
+  XMLElement clone(bool deep);
+}
 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 interface XMLHttpRequestEvents extends Events {
   EventListenerList get abort();
   EventListenerList get error();
   EventListenerList get load();
   EventListenerList get loadStart();
   EventListenerList get progress();
@@ skipping 18 matching lines @@
   XMLHttpRequest.getTEMPNAME(String url, onSuccess(XMLHttpRequest request));
 
   int get readyState();
 
   String get responseText();
 
   String get responseType();
 
   void set responseType(String value);
 
-  Document get responseXML();
+  XMLDocument get responseXML();
 
   int get status();
 
   String get statusText();
 
   XMLHttpRequestUpload get upload();
 
   bool get withCredentials();
 
   void set withCredentials(bool value);
@@ skipping 35 matching lines @@
   EventListenerList get abort();
   EventListenerList get error();
   EventListenerList get load();
   EventListenerList get loadStart();
   EventListenerList get progress();
 }
 
 interface XMLHttpRequestUpload extends EventTarget {
   XMLHttpRequestUploadEvents get on();
 }